From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7984C5B578 for ; Fri, 28 Jun 2019 22:49:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B454C20828 for ; Fri, 28 Jun 2019 22:49:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726958AbfF1WtJ (ORCPT ); Fri, 28 Jun 2019 18:49:09 -0400 Received: from mga12.intel.com ([192.55.52.136]:42188 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726921AbfF1WtI (ORCPT ); Fri, 28 Jun 2019 18:49:08 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 28 Jun 2019 15:49:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,429,1557212400"; d="scan'208";a="338039150" Received: from jtkirshe-desk1.jf.intel.com ([134.134.177.96]) by orsmga005.jf.intel.com with ESMTP; 28 Jun 2019 15:49:05 -0700 From: Jeff Kirsher To: davem@davemloft.net Cc: Artem Bityutskiy , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, Aaron Brown , Jeff Kirsher Subject: [net-next 10/15] igb: add RR2DCDELAY to ethtool registers dump Date: Fri, 28 Jun 2019 15:49:27 -0700 Message-Id: <20190628224932.3389-11-jeffrey.t.kirsher@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190628224932.3389-1-jeffrey.t.kirsher@intel.com> References: <20190628224932.3389-1-jeffrey.t.kirsher@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Artem Bityutskiy This patch adds the RR2DCDELAY register to the ethtool registers dump. RR2DCDELAY exists on I210 and I211 Intel Gigabit Ethernet chips and it stands for "Read Request To Data Completion Delay". Here is how this register is described in the I210 datasheet: "This field captures the maximum PCIe split time in 16 ns units, which is the maximum delay between the read request to the first data completion. This is giving an estimation of the PCIe round trip time." In other words, whenever I210 reads from the host memory (e.g., fetches a descriptor from the ring), the chip measures every PCI DMA read transaction and captures the maximum value. So it ends up containing the longest DMA transaction time. This register is very useful for troubleshooting and research purposes. If you are dealing with time-sensitive networks, this register can help you get an idea of your "I210-to-ring" latency. This helps answering questions like "should I have PCIe ASPM enabled?" or "should I enable deep C-states?" on my system. It is safe to read this register at any point, reading it has no effect on the I210 chip functionality. Signed-off-by: Artem Bityutskiy Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/igb/e1000_regs.h | 2 ++ drivers/net/ethernet/intel/igb/igb_ethtool.c | 5 ++++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/igb/e1000_regs.h b/drivers/net/ethernet/intel/igb/e1000_regs.h index 0ad737d2f289..9cb49980ec2d 100644 --- a/drivers/net/ethernet/intel/igb/e1000_regs.h +++ b/drivers/net/ethernet/intel/igb/e1000_regs.h @@ -409,6 +409,8 @@ do { \ #define E1000_I210_TQAVCC(_n) (0x3004 + ((_n) * 0x40)) #define E1000_I210_TQAVHC(_n) (0x300C + ((_n) * 0x40)) +#define E1000_I210_RR2DCDELAY 0x5BF4 + #define E1000_INVM_DATA_REG(_n) (0x12120 + 4*(_n)) #define E1000_INVM_SIZE 64 /* Number of INVM Data Registers */ diff --git a/drivers/net/ethernet/intel/igb/igb_ethtool.c b/drivers/net/ethernet/intel/igb/igb_ethtool.c index 401bc2bd6b21..3182b059bf55 100644 --- a/drivers/net/ethernet/intel/igb/igb_ethtool.c +++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c @@ -448,7 +448,7 @@ static void igb_set_msglevel(struct net_device *netdev, u32 data) static int igb_get_regs_len(struct net_device *netdev) { -#define IGB_REGS_LEN 739 +#define IGB_REGS_LEN 740 return IGB_REGS_LEN * sizeof(u32); } @@ -710,6 +710,9 @@ static void igb_get_regs(struct net_device *netdev, for (i = 0; i < 12; i++) regs_buff[727 + i] = rd32(E1000_TDWBAH(i + 4)); } + + if (hw->mac.type == e1000_i210 || hw->mac.type == e1000_i211) + regs_buff[739] = rd32(E1000_I210_RR2DCDELAY); } static int igb_get_eeprom_len(struct net_device *netdev) -- 2.21.0